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A global model of natural volatile organic compound emissions

 
: Guenther, A.; Hewitt, N.C.; Erickson, D.; Fall, R.; Geron, C.; Graedel, T.; Harley, P.; Klinger, L.; Lerdau, M.; McKay, W.A.; Pierce, T.; Scholes, B.; Steinbrecher, R.; Taalamraju, R.; Taylor, J.; Zimmermann, P.

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Journal of geophysical research. D, Atmospheres 100 (1995), No.5, pp.8873-8892 : Ill., Lit.
ISSN: 0148-0227
English
Journal Article
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

Abstract
Numerical assessments of global air quality and potential changes in atmospheric chemical constituents require estimates of the surface fluxes of a variety of trace gas species. We have developed a global model to estimate emissions of volatile organic compounds from natural sources (NVOC). Methane is not considered here and has been reviewed in detail elsewhere. The model has a highly resolved spatial grid (0.5 degree x 0.5 degree latitude/longitude) and generates hourly average emission estimates. Chemical species are grouped into four categories: isoprene, monoterpenes, other reactive VOC (ORVOC), and other VOC (OVOC). NVOC emissions from oceans are estimated as a function of geophysical variables from a general circulation model and ocean color satellite data. Emissions from plant foliage are estimated from ecosystem specific biomass and emission factors and algorithms describing light and temperature dependence of NVOC emissions. Foliar density estimates are based on climatic vari ables and satellite data. Temporal variations in the model are driven by monthly estimates of biomass and temperature and hourly light estimates. The annual global VOC flux is estimated to be 1150 Tg C, composed of 44 per cent isoprene, 11 per cent monoterpenes, 22.5 per cent other reactive VOC, and 22.5 per cent other VOC. Large uncertainties exist for each of these estimates and particularly for compounds other than isoprene and monoterpenes. Tropical woodlands (rain forest, seasonal, drought-deciduous, and savanna) contribute about half of all global natural VOC emissions. Croplands, shrublands and other woodlands contribute 10-20 per cent apiece. Isoprene emissions calculated for temperate regions are as much as a factor of 5 higher than previous estimates.

: http://publica.fraunhofer.de/documents/PX-16220.html